text: /*-
   * Copyright (c) 1991 Keith Muller.
   * Copyright (c) 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * This code is derived from software contributed to Berkeley by
   * Keith Muller of the University of California, San Diego.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Berkeley and its contributors.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #if 0
  #ifndef lint
  static char sccsid[] = "@(#)egetopt.c	8.1 (Berkeley) 6/6/93";
  #endif /* not lint */
  #endif
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD: soc2013/dpl/head/usr.bin/pr/egetopt.c 204402 2010-02-26 13:48:04Z ed $");
  
  #include <ctype.h>
  #include <stdio.h>
  #include <string.h>
  
  #include "extern.h"
  
  /*
   * egetopt:	get option letter from argument vector (an extended
   *		version of getopt).
   *
   * Non standard additions to the ostr specs are:
   * 1) '?': immediate value following arg is optional (no white space
   *    between the arg and the value)
   * 2) '#': +/- followed by a number (with an optional sign but
   *    no white space between the arg and the number). The - may be
   *    combined with other options, but the + cannot.
   */
  
  int	eopterr = 1;		/* if error message should be printed */
  int	eoptind = 1;		/* index into parent argv vector */
  int	eoptopt;		/* character checked for validity */
  char	*eoptarg;		/* argument associated with option */
  
  #define	BADCH	(int)'?'
  
  static char	emsg[] = "";
  
  int
  egetopt(int nargc, char * const *nargv, const char *ostr)
  {
  	static char *place = emsg;	/* option letter processing */
  	char *oli;			/* option letter list index */
  	static int delim;		/* which option delimeter */
  	char *p;
  	static char savec = '\0';
  
  	if (savec != '\0') {
  		*place = savec;
  		savec = '\0';
  	}
  
  	if (!*place) {
  		/*
  		 * update scanning pointer
  		 */
  		if ((eoptind >= nargc) ||
  		    ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
  			place = emsg;
  			return (-1);
  		}
  
  		delim = (int)*place;
  		if (place[1] && *++place == '-' && !place[1]) {
  			/*
  			 * found "--"
  			 */
  			++eoptind;
  			place = emsg;
  			return (-1);
  		}
  	}
  
  	/*
  	 * check option letter
  	 */
  	if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
  	    !(oli = strchr(ostr, eoptopt))) {
  		/*
  		 * if the user didn't specify '-' as an option,
  		 * assume it means -1 when by itself.
  		 */
  		if ((eoptopt == (int)'-') && !*place)
  			return (-1);
  		if (strchr(ostr, '#') && (isdigit(eoptopt) ||
  		    (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
  		      isdigit(*place)))) {
  			/*
  			 * # option: +/- with a number is ok
  			 */
  			for (p = place; *p != '\0'; ++p) {
  				if (!isdigit(*p))
  					break;
  			}
  			eoptarg = place-1;
  
  			if (*p == '\0') {
  				place = emsg;
  				++eoptind;
  			} else {
  				place = p;
  				savec = *p;
  				*place = '\0';
  			}
  			return (delim);
  		}
  
  		if (!*place)
  			++eoptind;
  		if (eopterr) {
  			if (!(p = strrchr(*nargv, '/')))
  				p = *nargv;
  			else
  				++p;
  			(void)fprintf(stderr, "%s: illegal option -- %c\n",
  			    p, eoptopt);
  		}
  		return (BADCH);
  	}
  	if (delim == (int)'+') {
  		/*
  		 * '+' is only allowed with numbers
  		 */
  		if (!*place)
  			++eoptind;
  		if (eopterr) {
  			if (!(p = strrchr(*nargv, '/')))
  				p = *nargv;
  			else
  				++p;
  			(void)fprintf(stderr,
  				"%s: illegal '+' delimiter with option -- %c\n",
  				p, eoptopt);
  		}
  		return (BADCH);
  	}
  	++oli;
  	if ((*oli != ':') && (*oli != '?')) {
  		/*
  		 * don't need argument
  		 */
  		eoptarg = NULL;
  		if (!*place)
  			++eoptind;
  		return (eoptopt);
  	}
  
  	if (*place) {
  		/*
  		 * no white space
  		 */
  		eoptarg = place;
  	} else if (*oli == '?') {
  		/*
  		 * no arg, but NOT required
  		 */
  		eoptarg = NULL;
  	} else if (nargc <= ++eoptind) {
  		/*
  		 * no arg, but IS required
  		 */
  		place = emsg;
  		if (eopterr) {
  			if (!(p = strrchr(*nargv, '/')))
  				p = *nargv;
  			else
  				++p;
  			(void)fprintf(stderr,
  			    "%s: option requires an argument -- %c\n", p,
  			    eoptopt);
  		}
  		return (BADCH);
  	} else {
  		/*
  		 * arg has white space
  		 */
  		eoptarg = nargv[eoptind];
  	}
  	place = emsg;
  	++eoptind;
  	return (eoptopt);
  }
  